Filamentous growth on sand

8galdorm

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There is this filamentous growth on my sand during the day that is not present at night and when I turn the light on initially in the morning. What could this be
 
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8galdorm

8galdorm

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For some reason it won't let me upload it, its a red-purple color
 

bct15

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Sounds like either Cyanobacteria or dinoflagellates
 

Reefing Madness

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Might just be a Filament Algae.
red-hair-algae-b.jpg
 

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